By Karen Rigsby and Zach Hansen

Chlorine demand is defined as ‘the inability to maintain a chlorine residual in a pool or spa’ even after repeated application of a chlorinating product. It is one of the most frustrating problems a pool owner can experience, as continued application of product seems to make no difference in water quality or in the ability to maintain a sanitizer residual.

Think of it like an overdrawn bank account. For … Continue reading How to prevent and treat depleted sanitizer levels in pool water